SWUpdate through 2026.05.1 contains an improper certificate validation vulnerability in crypto/swupdate_cms_verify_openssl.c that trusts untrusted X.509 certificates embedded in CMS SignedData for chain building. Attackers holding a signing key from a sibling intermediate under the same root can embed that intermediate in the signature to install malicious updates.

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History

Mon, 12 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Description SWUpdate through 2026.05.1 contains an improper certificate validation vulnerability in crypto/swupdate_cms_verify_openssl.c that trusts untrusted X.509 certificates embedded in CMS SignedData for chain building. Attackers holding a signing key from a sibling intermediate under the same root can embed that intermediate in the signature to install malicious updates.
Title SWUpdate through 2026.05.1 CMS Signature Verification Bypass via Embedded Intermediates
First Time appeared Swupdate
Swupdate swupdate
Weaknesses CWE-295
CPEs cpe:2.3:a:swupdate:swupdate:*:*:*:*:*:*:*:*
Vendors & Products Swupdate
Swupdate swupdate
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-12T15:16:44.440Z

Reserved: 2026-10-12T14:40:48.738Z

Link: CVE-2026-109399

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-12T16:17:05.557

Modified: 2026-10-12T16:17:05.557

Link: CVE-2026-109399

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-12T16:45:14Z

Weaknesses